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A method for amplitude and phase control of grid-dominated voltage source converter

A voltage source converter, amplitude and phase control technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problem that it is difficult to suppress the power oscillation of the converter, improve the small signal dynamic stability domain, suppress power Oscillating effect

Active Publication Date: 2022-03-29
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

However, this scheme does not start from revealing the power oscillation mechanism, and it is difficult to suppress the power oscillation between the converter and the traditional synchronous generator

Method used

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  • A method for amplitude and phase control of grid-dominated voltage source converter
  • A method for amplitude and phase control of grid-dominated voltage source converter
  • A method for amplitude and phase control of grid-dominated voltage source converter

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the accompanying drawings, specific implementation methods and examples.

[0072] Such as figure 2 As shown, the present invention changes the instantaneous output electromagnetic power of the converter by controlling the terminal voltage phase of the grid-dominated converter, thereby suppressing system power oscillation. First, based on the dynamic differential equations of traditional synchronous generators and grid-dominated converters and the algebraic equations of the microgrid, the dynamic equation of the micro-increase rate of the whole system is established; based on the dynamic equation of the micro-increase rate, the Lyapunov stability of the whole system is evaluated , and design the additional controller of the grid-dominated converter; finally, by collecting the angular frequency of the traditional synchronous generator and the grid-dominated converter, the instantaneous output elect...

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Abstract

A grid-dominated voltage source converter amplitude and phase control method, first establishes multi-type power supply dynamic differential and microgrid algebraic equations, proposes a grid-dominated voltage source converter compensation control loop, and then establishes multi-type power supply and commutation In order to ensure the dynamic stability of the whole system, based on the transient energy function of the micro-increase rate model, the parameters of the compensation control loop and the adjustment of the amplitude and phase variables are designed to suppress multiple Power oscillations between types of power supplies.

Description

technical field [0001] The invention relates to a control method of a grid-dominated voltage source converter. Background technique [0002] At present, distributed wind power and photovoltaic power generation, DC loads and energy storage devices are generally connected to AC microgrids through voltage source converters. The traditional voltage source converter tracks the grid frequency through a phase-locked loop. Compared with the power angle characteristics of conventional synchronous generators such as gas turbines, it shows characteristics such as constant current source access, maximum power input or output, and no spinning reserve. As more current source converters replace conventional synchronous generators, that is, to increase the proportion of new energy power generation and reduce the start-up of synchronous generators, the overall inertia of the system and the active rotating reserve capacity will decrease, and the power supply’s ability to support the grid volt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/40
CPCH02J3/241H02J3/40H02J2203/20
Inventor 叶华刘垚裴玮孔力
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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